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Post balance sheet events - Additional Information (Detail) - Events After Reporting Period [member] - Kantar [member] £ in Billions	Jul. 09, 2019 GBP (£)
Statement [LineItems]
Percentage to be sold of proposed sale	60.00%
Percentage of ownership after proposed sale	40.00%
Proceeds from proposed sale	£ 3.1

X

- Definition

Approximate Consideration From Proposed Sale After Tax and Disposal Costs.

+ References

No definition available.

+ Details

Name:	wpp_ApproximateConsiderationFromProposedSaleAfterTaxAndDisposalCosts
Namespace Prefix:	wpp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Percentage of ownership after proposed sale.

+ References

No definition available.

+ Details

Name:	wpp_PercentageOfOwnershipAfterProposedSale
Namespace Prefix:	wpp_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percentage to be sold of proposed sale.

+ References

No definition available.

+ Details

Name:	wpp_PercentageToBeSoldOfProposedSale
Namespace Prefix:	wpp_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	wpp_StatementLineItems
Namespace Prefix:	wpp_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	ifrs-full_NonadjustingEventsAfterReportingPeriodAxis=wpp_EventsAfterReportingPeriodMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	wpp_DisposalsAxis=wpp_KantarMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: